Havbeat Technology Co. Ltd., Cofounder                        04/2022 - 

1. Developed a cost-efficient server configuration under $300 USD/month across multiple cloud services (AWS, GCP, and DigitalOcean), supporting over 30,000 monthly active users in a serverless environment. 
2. Migrated multiple repositories of the product into a monorepo to enhance the development experience for a small developer team. 
3. Modularized customer feature requirements and project PRDs, breaking them down into Scrum sprints to adhere to time and cost constraints across projects. 
4. Implemented multi-tenancy in our product to optimize costs, enhance permission control, and ensure feature isolation among different customers.
   

URFiT Tech., Tech Lead                                                       02/2020 - 03/2022

1. Led a development team of five, including three senior engineers and two junior engineers, applying the Scrum approach to ensure weekly feature delivery and adapt swiftly to market changes. 
2. Increased backend code coverage from below 10% to over 90%, significantly enhancing system reliability. 
3. Migrated backend services from solely using AWS EC2 to incorporating Code Pipeline and ECS with both regular and spot instances, optimizing continuous integration stability and server cost efficiency. 
4. Achieved deep integration with major Taiwanese payment gateways, including ECPay, NewebPay, Chailease Zingala, TapPay, and EZPay, enhancing transaction capabilities.
   

Norika Co. Ltd., Full Stack Engineer                                  10/2018 - 01/2020

1. Reduced server costs by approximately 30% by utilizing AWS ECS and Spot Instances. 
2. Implemented infrastructure as code using Terraform to automate AWS server deployments, ensuring synchronization between staging and production environments. 
3. Developed backend APIs with GraphQL to simplify frontend interactions, reducing the number of queries required and enhancing API intuitiveness. 
4. Implemented unit testing using Rspec, achieving 98% test coverage, and integrated deployments to AWS servers via AWS CodePipeline. 
5. Deployed applications in a fully containerized environment using AWS ECS and EC2 within a VPC, using ALB as the endpoint for client communications, and implemented zero-downtime rolling deployments via CodePipeline to ECS. 
6. Automated frontend deployments using GitLab CI to AWS S3 and CloudFront CDN, optimizing content delivery. 
7. Developed chatbots and crawlers using AWS Lambda with Ruby/Node.js, storing results in AWS DynamoDB. 
8. Developed a real-time streaming server using FFmpeg and Nginx-rtmp, enhancing media streaming capabilities.
   

inQtech Co. Ltd., Server Engineer.                                     07/2016 - 05/2018

1. Install server and manage bare metal machines, including purchasing decision.
2. Image Recognition: Using OpenCV to develop manufacturing automation and deploy the code into embed machine

Viking Bar, Minister of IT                                                     05/2015 - 05/2018

1. Improve loading time: from 2 sec. to less than 0.5 sec., and improve user experience.
2. Fix website vulnerability: Fix all vulnerabilities of website, and make an intrusion detection to ensure there are no significant leak of our server.
3. Training of web admin: train new crew with knowledge of web admin and practical training.

New year event page                                                               01/2020

Acuvue event page                                                                  07/2019

Brand new start camp official site                                        07/2018

2nd Position, National Palace Museum Hackathon           09/2017

Database of NTU Business Administration                         04/2017

22th NTU Art Festival Project: CONTROL(異識流) site        03/2016

PM2.5 realtime prediction App                                              07/2016